The pass result of 50 students who took up a class test is given below: marks 40 50 60 70 80 90 no. Of students 8 10 9 6 4 3 if the average mark of all 50 students was 51.6 find out the average mark of the students who failed

Layer r contains a well-known index fossil that is 100 million years old. based on this information and the principle of superposition, a. layers t and m are older than 100 million years, and layers x and g are younger than 100 million years. b. layers t, m, x, and g are all older than 100 million years. c. layers t and m are younger than 100 million years, and layers x and g are older than 100 million years.